Pencil sharpener



FIG. 1 is a perspective view of a pencil sharpener showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a pencil sharpener, as shown. 